论文标题
用膜谐振器设计高薄的声学元面
Designing Hyper-Thin Acoustic Metasurfaces with Membrane Resonators
论文作者
论文摘要
我们设计了极其薄的声学元信息，为操纵反射压力场的多功能平台提供了一种多功能平台，这些平台是由质量负载和固定在周期性刚性框架上的拉伸膜构造的。这些元信息表现出深度的次波长控制，并且比基于Helmholtz谐振器的厚度较小的厚度较小。元表面的每个子单元都以几何调节的频率调谐，可调节性提供相位控制，并使用一组精细调谐的膜谐振器我们创建一个相胶化的跨表面。该表面旨在以波长（$λ$，厚度，$ h $，$λ/h \约23.1 $）的比例展示全角负反射，并使用椭圆形反射镜的相位曲线创建平面镜。另一个重要的声学应用是声音扩散器，我们继续设计一个基于下部的膜元 - 散布器，它可能比操作波长薄的两个数量级，即厚度$ \ of of of themes $ \ oftive $ \ of大约λ/102 $。这为开发具有适用于声音相关行业功能性声学设备的高级声学元信息铺平了道路。
We design extremely-thin acoustic metasurfaces, providing a versatile platform for the manipulation of reflected pressure fields, that are constructed from mass loads and stretched membranes fixed to a periodic rigid framework. These metasurfaces demonstrate deeply subwavelength control and can have thicknesses an order of magnitude less than those based around Helmholtz resonators. Each sub-unit of the metasurface is resonant at a frequency tuned geometrically, this tunability provides phase control and using a set of finely tuned membrane resonators we create a phase-grating metasurface. This surface is designed to exhibit all-angle negative reflections with the ratio of wavelength, $λ$, to thickness, $h$, of $λ/h\approx 23.1$, and to create a flat mirror using the phase profile of an elliptic reflecting mirror. A further important acoustic application is to sound diffusers and we proceed to design a deeply subwavelength membrane-based meta-diffuser that can be two orders of magnitude thinner than the operating wavelength, i.e. thickness $\approxλ/102$. This paves the way for developing advanced acoustic metasurfaces with applicability to functional acoustic devices in sound-related industries.
